I would say a red snapper.
The blobfish appears pink or reddish in color when it is deep-sea dwelling due to the lack of pigmentation in its skin and the pressure of the deep sea.
Rudd
The Reddish egret eats fish, frogs crustaceans and small invertebrates.
It is a holocephalan cartilaginous fish.
cannibalism (i think that's term your looking for)
There was a deep trough where the lake water emptied into the river.Scientists have been looking for rare fish in the deep underwater trough.
They are ugly looking to humans so we mainly don't hunt them, and are too deep to fish for.
most likly blood
It's called an angler fish
Sounds like you are looking for the "bitey" fish called the piranha,
deep deep deep underwater
Yes. These new fish are called deep sea glass squids or Teuthowenia Pellucid.